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Details for Benchmark: GQ0011

N 36° 43.500 W 112° 04.300 (NAD 83)

Altitude: 6153.35

Coordinates may not be exact. Altitude is POSTED and location is SCALED. (more info)

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
L 51
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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N 36° 43.514 W 112° 04.385

Found this benchmark today in good condition.

[Photos:]
photoCloseup of the benchmark with GPS
photoWide view looking east
N 36° 43.515 W 112° 04.385

Bench Mark L 51 was recovered as described, in good condition.

[Photos:]
photoGQ0011 20060509 G (Coconino Co. AZ)
Bench Mark L 51 w/GPSr.
photoGQ0011 20060509 C (Coconino Co. AZ)
Bench Mark L 51.
photoGQ0011 20060509 B (Coconino Co. AZ)
Bench Mark L 51 from Eye Level.
photoGQ0011 20060509 A1 N (Coconino Co. AZ)
North at Bench Mark L 51.
photoGQ0011 20060509 A2 W (Coconino Co. AZ)
West at Bench Mark L 51.
N 36° 43.514 W 112° 04.386

Recovered in good condition as described.

[Photos:]
photoL 51 along Hwy 89 headed towards Jacob Lake
photoL 51 looking towards the east
photoL 51 looking towards the west

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 3.0 MI W FROM HOUSE ROCK SPRINGS. 3.0 MILES WEST ALONG U.S. HIGHWAY 89 FROM HOUSE ROCK SPRINGS, COCONINO COUNTY, 250 FEET WEST OF A LARGE CUT, 54 FEET NORTH OF THE CENTERLINE OF THE HIGHWAY, AND IN THE TOP OF A LIMESTONE OUTCROP. A STANDARD DISK, STAMPED L 51 1934.
1/1/1953 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1953 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in 1992. * This is a POSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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